Here is a list of all namespaces with brief descriptions:

[detail level 12345]

Nastro
Ncapability
Nchart
Ndetail
Ncoords
Ndelta_t
Nalgo1
Nalgo2
Nalgo3
Nalgo4
Nalgo5
Nearth
Nheliocentric_coord
Nnutation
Nobliquity
Naberration
Nprecession
Nrefraction
Ndetail
Nelp2000_82b
Ncoeff
Ndetail
Nephemeris
Ndetail
Ndetail
Nevent_search
Ngeolocation
Nhouse
Ndetail
Nillumination
Ndetail
Njulian_day
Nleap_second
Nlunar_node
Ndetail
Nmoon
Nperturbation
Ngeocentric_coord
Nequatorial_coord
Nmoon_phase
Nphase_moments
Ndetail
Nnew_moon
Nillumination
Nplanet
Ndetail
Npluto
Ngeocentric_coord
Nobservation
Nphenomena
Ndetail
Nrise_set	Body-agnostic rise/transit/set engine
Ndetail
Nsun	Solar conventions and entry points: standard altitudes, twilight constants, and the transit-centered API wired to the Sun's ephemeris
Nmoon	Lunar conventions and entry points: the Ch.15 standard altitude and the UT-day (almanac-style) API wired to the ELP2000-82B ephemeris
Nsidereal
Nsolar_time
Ndetail
Nsun
Ngeocentric_coord
Nmath
Ndetail
Nequatorial_coord
Ntoolbox
Nliterals
Nvsop87d
Ncalendar
Ndetail
Njieqi
Ndetail
Nlunar
Nalgo1
Ncommon
Nalgo2
Nalgo3
Nconverter
Nutil
Ncache
Nhash
Nymd_operator